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Cheap flights from St. Louis to Sofia from $543

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Sofia departing on 1/28. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from St. Louis to Sofia

Cheap round-trip flights

Enter your travel dates to find the best prices.
Lufthansa Logo
1:15 pm - 1:15 pmSTL-SOF
16h 00m2 stops
Lufthansa Logo
6:10 am - 11:59 pmSOF-STL
25h 49m2 stops
$543Lufthansa
Find Deal
Wed, Jan 28 - Sun, Feb 1
Lufthansa Logo
3:50 pm - 1:50 pmSTL-SOF
14h 00m1 stop
Lufthansa Logo
6:10 am - 10:58 pmSOF-STL
24h 48m2 stops
$551Lufthansa
Find Deal
Wed, Jan 28 - Sun, Feb 1
Multiple Airlines Logo
3:50 pm - 1:50 pmSTL-SOF
14h 00m1 stop
Multiple Airlines Logo
12:35 pm - 11:59 pmSOF-STL
43h 24m2 stops
$731Multiple Airlines
Find Deal
Wed, Dec 31 - Wed, Jan 7
United Airlines Logo
9:55 am - 10:45 pmSTL-SOF
28h 50m2 stops
United Airlines Logo
2:25 pm - 7:27 pmSOF-STL
37h 02m2 stops
$742United Airlines
Find Deal
Wed, Dec 31 - Wed, Jan 7
Lufthansa Logo
4:50 pm - 1:35 pmSTL-SOF
13h 45m1 stop
Lufthansa Logo
6:10 am - 7:48 pmSOF-STL
21h 38m2 stops
$801Lufthansa
Find Deal
Fri, Mar 27 - Tue, Mar 31
Lufthansa Logo
4:50 pm - 1:35 pmSTL-SOF
13h 45m1 stop
Lufthansa Logo
2:00 pm - 1:30 pmSOF-STL
31h 30m1 stop
$812Lufthansa
Find Deal
Fri, Mar 27 - Tue, Mar 31
Lufthansa Logo
4:50 pm - 10:45 pmSTL-SOF
22h 55m2 stops
Lufthansa Logo
6:10 am - 7:48 pmSOF-STL
21h 38m2 stops
$825Lufthansa
Find Deal
Fri, Mar 27 - Tue, Mar 31
Lufthansa Logo
3:50 pm - 1:50 pmSTL-SOF
14h 00m1 stop
Lufthansa Logo
6:10 am - 1:55 pmSOF-STL
15h 45m1 stop
$901Lufthansa
Find Deal
Wed, Dec 31 - Wed, Jan 7
Multiple Airlines Logo
4:05 pm - 10:45 pmSTL-SOF
22h 40m2 stops
Multiple Airlines Logo
6:10 am - 9:13 pmSOF-STL
23h 03m3 stops
$1,479Multiple Airlines
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Wed, Dec 31 - Wed, Jan 7
United Airlines Logo
6:35 pm - 1:15 pmSTL-SOF
34h 40m2 stops
United Airlines Logo
2:25 pm - 10:58 pmSOF-STL
40h 33m2 stops
$1,519United Airlines
Find Deal
Sun, Dec 21 - Sun, Jan 11

United Airlines flights from St. Louis to Sofia

Our best United Airlines deals on St. Louis to Sofia flight tickets
United Airlines
Dec 31
STL9:55 amLambert-St Louis
28h 50m
2 stops
SOF10:45 pmSofia
Jan 7
SOF2:25 pmSofia
37h 02m
2 stops
STL7:27 pmLambert-St Louis
$742
Find similar
United Airlines
Dec 21
STL6:35 pmLambert-St Louis
34h 40m
2 stops
SOF1:15 pmSofia
Jan 11
SOF2:25 pmSofia
40h 33m
2 stops
STL10:58 pmLambert-St Louis
$1,519
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Lufthansa flights from St. Louis to Sofia

Our best Lufthansa deals on St. Louis to Sofia flight tickets
Lufthansa
Jan 28
STL1:15 pmLambert-St Louis
16h 00m
2 stops
SOF1:15 pmSofia
Feb 1
SOF6:10 amSofia
25h 49m
2 stops
STL11:59 pmLambert-St Louis
$543
Find similar
Lufthansa
Jan 28
STL3:50 pmLambert-St Louis
14h 00m
1 stop
SOF1:50 pmSofia
Feb 1
SOF6:10 amSofia
24h 48m
2 stops
STL10:58 pmLambert-St Louis
$551
Find similar
Lufthansa
Mar 27
STL4:50 pmLambert-St Louis
13h 45m
1 stop
SOF1:35 pmSofia
Mar 31
SOF6:10 amSofia
21h 38m
2 stops
STL7:48 pmLambert-St Louis
$801
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Sofia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated November 18, 2025.
Use the filters below to find and compare flights from St. Louis to Sofia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 1/28

1:15 pm-1:15 pm

2 stops16h 00m

Sofia

Sun 2/1

6:10 am-11:59 pm

2 stops25h 49m

$543

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 1/28

3:50 pm-1:50 pm

1 stop14h 00m

Sofia

Sun 2/1

6:10 am-10:58 pm

2 stops24h 48m

$551

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 12/31

3:50 pm-1:50 pm

1 stop14h 00m

Sofia

Wed 1/7

12:35 pm-11:59 pm

2 stops43h 24m

$731

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 12/31

9:55 am-10:45 pm

2 stops28h 50m

Sofia

Wed 1/7

2:25 pm-7:27 pm

2 stops37h 02m

$742

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Fri 3/27

4:50 pm-1:35 pm

1 stop13h 45m

Sofia

Tue 3/31

6:10 am-7:48 pm

2 stops21h 38m

$801

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Fri 3/27

4:50 pm-1:35 pm

1 stop13h 45m

Sofia

Tue 3/31

2:00 pm-1:30 pm

1 stop31h 30m

$812

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Fri 3/27

4:50 pm-10:45 pm

2 stops22h 55m

Sofia

Tue 3/31

6:10 am-7:48 pm

2 stops21h 38m

$825

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 12/31

3:50 pm-1:50 pm

1 stop14h 00m

Sofia

Wed 1/7

6:10 am-1:55 pm

1 stop15h 45m

$901

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 12/31

4:05 pm-10:45 pm

2 stops22h 40m

Sofia

Wed 1/7

6:10 am-9:13 pm

3 stops23h 03m

$1,479

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 12/21

6:35 pm-1:15 pm

2 stops34h 40m

Sofia

Sun 1/11

2:25 pm-10:58 pm

2 stops40h 33m

$1,519

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Sofia from

How to get the cheapest flight ticket from St. Louis to Sofia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Sofia?

According to our data, Saturday is the cheapest day to fly to Sofia from St. Louis. The lowest ticket price found for a Saturday departure recently was $1,095. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Flights from St. Louis to Sofia on a Friday will generally be more expensive and average around $1,306. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Sofia?

In the morning is the cheapest time of day to fly from St. Louis to Sofia when you can find flight prices for as low as $1,199. Flying to Sofia in the morning is an ideal time because this is during off-peak travel hours. In the afternoon is when there is more demand to fly to Sofia, so prices are often more expensive at around $1,335 per ticket.

How far in advance should I book a flight to Sofia?

You are more likely to see cheaper flights to Sofia from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Sofia for around $937 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sofia from St. Louis for as low as $799 on momondo.

Can stopping save me money on St. Louis to Sofia flights?

You could potentially save up to 13% on your flight if you consider stops on a St. Louis to Sofia flight.

When to book flights from St. Louis to Sofia

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Sofia according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Sofia (STL to SOF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Sofia

Direct flights

None
There are no direct flights from St. Louis to Sofia. There are no popular flight routes from St. Louis to Sofia.
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  • How far is Lambert-St Louis to Sofia by plane?

    A flight from Lambert-St Louis to Sofia will travel around 5441.0 mi. 13h 45m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Sofia Airport?

    Prices for flights from Lambert-St Louis Airport to Sofia Airport are updated daily.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Sofia Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Sofia Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Sofia Airport.

  • What documentation or ID do you need to fly to Sofia Airport?

    The travel and health documents you'll need for your trip to Sofia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Sofia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from St. Louis to Sofia?

Best airlines flying from St. Louis to Sofia

Compare and see reviews for airlines that fly from St. Louis to Sofia with momondo
Airline
Rating
Free Cancellation
Price
LufthansaPriceFrom $669Free CancellationRating
6.8
7,576 reviews
Search Lufthansa flights
United AirlinesPriceFrom $711Free CancellationRating
7.4
9,019 reviews
Search United Airlines flights

Traveling to a place near Sofia?

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Bansko
Borovets
Velingrad
Sandanski

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Why should I use momondo to find a flight deal from St. Louis to Sofia?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Sofia. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to Sofia with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Sofia from St. Louis with this policy.

How can momondo help me find flights from St. Louis to Sofia?

Once all potential St. Louis to Sofia flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from St. Louis to Sofia right now. Can momondo alert me if prices change?

Price alerts on flights to Sofia from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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